[ViewVC] Diff of: cvs/gvpe/src/connection.C

Comparing gvpe/src/connection.C (file contents):
Revision 1.2 by pcg, Wed Apr 2 03:25:17 2003 UTC vs.
Revision 1.23 by pcg, Wed Oct 22 00:42:53 2003 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		3	Copyright (C) 2003 Marc Lehmann <pcg@goof.com>
3		4
4	This program is free software; you can redistribute it and/or modify	5	This program is free software; you can redistribute it and/or modify
5	it under the terms of the GNU General Public License as published by	6	it under the terms of the GNU General Public License as published by
6	the Free Software Foundation; either version 2 of the License, or	7	the Free Software Foundation; either version 2 of the License, or
7	(at your option) any later version.	8	(at your option) any later version.
35	#include "slog.h"	36	#include "slog.h"
36	#include "device.h"	37	#include "device.h"
37	#include "vpn.h"	38	#include "vpn.h"
38	#include "connection.h"	39	#include "connection.h"
39		40
		41	#include "netcompat.h"
		42
40	#if !HAVE_RAND_PSEUDO_BYTES	43	#if !HAVE_RAND_PSEUDO_BYTES
41	# define RAND_pseudo_bytes RAND_bytes	44	# define RAND_pseudo_bytes RAND_bytes
42	#endif	45	#endif
43		46
44	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	47	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic
…		…
85	rsachallenge chg;	88	rsachallenge chg;
86	};	89	};
87		90
88	struct rsa_cache : list<rsa_entry>	91	struct rsa_cache : list<rsa_entry>
89	{	92	{
90	void cleaner_cb (tstamp &ts); time_watcher cleaner;	93	void cleaner_cb (time_watcher &w); time_watcher cleaner;
91		94
92	bool find (const rsaid &id, rsachallenge &chg)	95	bool find (const rsaid &id, rsachallenge &chg)
93	{	96	{
94	for (iterator i = begin (); i != end (); ++i)	97	for (iterator i = begin (); i != end (); ++i)
95	{	98	{
…		…
129	: cleaner (this, &rsa_cache::cleaner_cb)	132	: cleaner (this, &rsa_cache::cleaner_cb)
130	{ }	133	{ }
131		134
132	} rsa_cache;	135	} rsa_cache;
133		136
134	void rsa_cache::cleaner_cb (tstamp &ts)	137	void rsa_cache::cleaner_cb (time_watcher &w)
135	{	138	{
136	if (empty ())	139	if (empty ())
137	ts = TSTAMP_CANCEL;	140	w.at = TSTAMP_CANCEL;
138	else	141	else
139	{	142	{
140	ts = NOW + RSA_TTL;	143	w.at = NOW + RSA_TTL;
141		144
142	for (iterator i = begin (); i != end (); )	145	for (iterator i = begin (); i != end (); )
143	if (i->expire <= NOW)	146	if (i->expire <= NOW)
144	i = erase (i);	147	i = erase (i);
145	else	148	else
…		…
147	}	150	}
148	}	151	}
149		152
150	//////////////////////////////////////////////////////////////////////////////	153	//////////////////////////////////////////////////////////////////////////////
151		154
152	void pkt_queue::put (tap_packet *p)	155	void pkt_queue::put (net_packet *p)
153	{	156	{
154	if (queue[i])	157	if (queue[i])
155	{	158	{
156	delete queue[i];	159	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;	160	j = (j + 1) % QUEUEDEPTH;
…		…
160	queue[i] = p;	163	queue[i] = p;
161		164
162	i = (i + 1) % QUEUEDEPTH;	165	i = (i + 1) % QUEUEDEPTH;
163	}	166	}
164		167
165	tap_packet *pkt_queue::get ()	168	net_packet *pkt_queue::get ()
166	{	169	{
167	tap_packet *p = queue[j];	170	net_packet *p = queue[j];
168		171
169	if (p)	172	if (p)
170	{	173	{
171	queue[j] = 0;	174	queue[j] = 0;
172	j = (j + 1) % QUEUEDEPTH;	175	j = (j + 1) % QUEUEDEPTH;
…		…
197	// only do action once every x seconds per host whole allowing bursts.	200	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	201	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	202	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	203	struct net_rate_limiter : list<net_rateinfo>
201	{	204	{
202	static const double ALPHA = 1. - 1. / 90.; // allow bursts	205	static const double ALPHA = 1. - 1. / 600.; // allow bursts
203	static const double CUTOFF = 20.; // one event every CUTOFF seconds	206	static const double CUTOFF = 10.; // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	207	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time
		208	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value
205		209
206	bool can (const sockinfo &si) { return can((u32)si.host); }	210	bool can (const sockinfo &si) { return can((u32)si.host); }
207	bool can (u32 host);	211	bool can (u32 host);
208	};	212	};
209		213
210	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	214	net_rate_limiter auth_rate_limiter, reset_rate_limiter;
211		215
…		…
225	{	229	{
226	net_rateinfo ri;	230	net_rateinfo ri;
227		231
228	ri.host = host;	232	ri.host = host;
229	ri.pcnt = 1.;	233	ri.pcnt = 1.;
230	ri.diff = CUTOFF * (1. / (1. - ALPHA));	234	ri.diff = MAXDIF;
231	ri.last = NOW;	235	ri.last = NOW;
232		236
233	push_front (ri);	237	push_front (ri);
234		238
235	return true;	239	return true;
…		…
242	ri.pcnt = ri.pcnt * ALPHA;	246	ri.pcnt = ri.pcnt * ALPHA;
243	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	247	ri.diff = ri.diff * ALPHA + (NOW - ri.last);
244		248
245	ri.last = NOW;	249	ri.last = NOW;
246		250
		251	double dif = ri.diff / ri.pcnt;
		252
247	bool send = ri.diff / ri.pcnt > CUTOFF;	253	bool send = dif > CUTOFF;
248		254
		255	if (dif > MAXDIF)
		256	{
		257	ri.pcnt = 1.;
		258	ri.diff = MAXDIF;
		259	}
249	if (send)	260	else if (send)
250	ri.pcnt++;	261	ri.pcnt++;
251		262
252	push_front (ri);	263	push_front (ri);
253		264
254	return send;	265	return send;
…		…
285	hmac_gen (ctx);	296	hmac_gen (ctx);
286		297
287	return !memcmp (hmac, hmac_digest, HMACLENGTH);	298	return !memcmp (hmac, hmac_digest, HMACLENGTH);
288	}	299	}
289		300
290	void vpn_packet::set_hdr (ptype type, unsigned int dst)	301	void vpn_packet::set_hdr (ptype type_, unsigned int dst)
291	{	302	{
292	this->type = type;	303	type = type_;
293		304
294	int src = THISNODE->id;	305	int src = THISNODE->id;
295		306
296	src1 = src;	307	src1 = src;
297	srcdst = ((src >> 8) << 4) \| (dst >> 8);	308	srcdst = ((src >> 8) << 4) \| (dst >> 8);
…		…
467	set_hdr (type, dst);	478	set_hdr (type, dst);
468	}	479	}
469		480
470	bool config_packet::chk_config () const	481	bool config_packet::chk_config () const
471	{	482	{
472	return prot_major == PROTOCOL_MAJOR	483	if (prot_major != PROTOCOL_MAJOR)
473	&& randsize == RAND_SIZE	484	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
474	&& hmaclen == HMACLENGTH	485	else if (randsize != RAND_SIZE)
475	&& flags == curflags ()	486	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
		487	else if (hmaclen != HMACLENGTH)
		488	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
		489	else if (flags != curflags ())
		490	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
476	&& challengelen == sizeof (rsachallenge)	491	else if (challengelen != sizeof (rsachallenge))
		492	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
477	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	493	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
		494	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
478	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	495	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
		496	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
479	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	497	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))
		498	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));
		499	else
		500	return true;
		501
		502	return false;
480	}	503	}
481		504
482	struct auth_req_packet : config_packet	505	struct auth_req_packet : config_packet
483	{	506	{
484	char magic[8];	507	char magic[8];
…		…
546	};	569	};
547		570
548	/////////////////////////////////////////////////////////////////////////////	571	/////////////////////////////////////////////////////////////////////////////
549		572
550	void	573	void
		574	connection::connection_established ()
		575	{
		576	if (ictx && octx)
		577	{
		578	connectmode = conf->connectmode;
		579
		580	rekey.start (NOW + ::conf.rekey);
		581	keepalive.start (NOW + ::conf.keepalive);
		582
		583	// send queued packets
		584	if (ictx && octx)
		585	{
		586	while (tap_packet p = (tap_packet )data_queue.get ())
		587	{
		588	send_data_packet (p);
		589	delete p;
		590	}
		591
		592	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
		593	{
		594	send_vpn_packet (p, si, IPTOS_RELIABILITY);
		595	delete p;
		596	}
		597	}
		598	}
		599	else
		600	{
		601	retry_cnt = 0;
		602	establish_connection.start (NOW + 5);
		603	keepalive.reset ();
		604	rekey.reset ();
		605	}
		606	}
		607
		608	void
551	connection::reset_dstaddr ()	609	connection::reset_si ()
552	{	610	{
553	si.set (conf);
554	}
555
556	void
557	connection::send_ping (const sockinfo &si, u8 pong)
558	{
559	ping_packet *pkt = new ping_packet;
560
561	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
562	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
563
564	delete pkt;
565	}
566
567	void
568	connection::send_reset (const sockinfo &si)
569	{
570	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
571	{
572	config_packet *pkt = new config_packet;
573
574	pkt->setup (vpn_packet::PT_RESET, conf->id);
575	send_vpn_packet (pkt, si, IPTOS_MINCOST);
576
577	delete pkt;
578	}
579	}
580
581	void
582	connection::send_auth_request (const sockinfo &si, bool initiate)
583	{
584	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
585
586	protocol = best_protocol (THISNODE->protocols & conf->protocols);	611	protocol = best_protocol (THISNODE->protocols & conf->protocols);
587		612
588	// mask out protocols we cannot establish	613	// mask out protocols we cannot establish
589	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	614	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
590	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	615	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
591		616
592	if (protocol)	617	si.set (conf, protocol);
		618	}
		619
		620	// ensure sockinfo is valid, forward if necessary
		621	const sockinfo &
		622	connection::forward_si (const sockinfo &si) const
		623	{
		624	if (!si.valid ())
		625	{
		626	connection *r = vpn->find_router ();
		627
		628	if (r)
		629	{
		630	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),
		631	conf->nodename, r->conf->nodename);
		632	return r->si;
		633	}
		634	else
		635	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),
		636	conf->nodename);
593	{	637	}
594	rsachallenge chg;
595		638
596	rsa_cache.gen (pkt->id, chg);	639	return si;
		640	}
597		641
598	if (0 > RSA_public_encrypt (sizeof chg,	642	void
599	(unsigned char )&chg, (unsigned char )&pkt->encr,	643	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
600	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))	644	{
601	fatal ("RSA_public_encrypt error");	645	if (!vpn->send_vpn_packet (pkt, si, tos))
		646	reset_connection ();
		647	}
602		648
603	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	649	void
		650	connection::send_ping (const sockinfo &si, u8 pong)
		651	{
		652	ping_packet *pkt = new ping_packet;
604		653
605	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	654	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		655	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
		656
		657	delete pkt;
		658	}
		659
		660	void
		661	connection::send_reset (const sockinfo &si)
		662	{
		663	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
		664	{
		665	config_packet *pkt = new config_packet;
		666
		667	pkt->setup (vpn_packet::PT_RESET, conf->id);
		668	send_vpn_packet (pkt, si, IPTOS_MINCOST);
606		669
607	delete pkt;	670	delete pkt;
608	}	671	}
609	else	672	}
610	; // silently fail	673
		674	void
		675	connection::send_auth_request (const sockinfo &si, bool initiate)
		676	{
		677	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
		678
		679	rsachallenge chg;
		680
		681	rsa_cache.gen (pkt->id, chg);
		682
		683	if (0 > RSA_public_encrypt (sizeof chg,
		684	(unsigned char )&chg, (unsigned char )&pkt->encr,
		685	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
		686	fatal ("RSA_public_encrypt error");
		687
		688	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
		689
		690	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
		691
		692	delete pkt;
611	}	693	}
612		694
613	void	695	void
614	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	696	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)
615	{	697	{
…		…
641		723
642	delete r;	724	delete r;
643	}	725	}
644		726
645	void	727	void
646	connection::establish_connection_cb (tstamp &ts)	728	connection::establish_connection_cb (time_watcher &w)
647	{	729	{
648	if (ictx \|\| conf == THISNODE	730	if (ictx \|\| conf == THISNODE
649	\|\| connectmode == conf_node::C_NEVER	731	\|\| connectmode == conf_node::C_NEVER
650	\|\| connectmode == conf_node::C_DISABLED)	732	\|\| connectmode == conf_node::C_DISABLED)
651	ts = TSTAMP_CANCEL;	733	w.at = TSTAMP_CANCEL;
652	else if (ts <= NOW)	734	else if (w.at <= NOW)
653	{	735	{
654	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	736	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;
655		737
656	if (retry_int < 3600 * 8)	738	if (retry_int < 3600 * 8)
657	retry_cnt++;	739	retry_cnt++;
658		740
659	ts = NOW + retry_int;	741	w.at = NOW + retry_int;
660		742
661	if (conf->hostname)	743	reset_si ();
		744
		745	if (si.prot && !si.host)
		746	vpn->send_connect_request (conf->id);
		747	else
662	{	748	{
663	reset_dstaddr ();	749	const sockinfo &dsi = forward_si (si);
		750
664	if (si.host && auth_rate_limiter.can (si))	751	if (dsi.valid () && auth_rate_limiter.can (dsi))
665	{	752	{
666	if (retry_cnt < 4)	753	if (retry_cnt < 4)
667	send_auth_request (si, true);	754	send_auth_request (dsi, true);
668	else	755	else
669	send_ping (si, 0);	756	send_ping (dsi, 0);
670	}	757	}
671	}	758	}
672	else
673	vpn->connect_request (conf->id);
674	}	759	}
675	}	760	}
676		761
677	void	762	void
678	connection::reset_connection ()	763	connection::reset_connection ()
…		…
707		792
708	reset_connection ();	793	reset_connection ();
709	}	794	}
710		795
711	void	796	void
712	connection::rekey_cb (tstamp &ts)	797	connection::rekey_cb (time_watcher &w)
713	{	798	{
714	ts = TSTAMP_CANCEL;	799	w.at = TSTAMP_CANCEL;
715		800
716	reset_connection ();	801	reset_connection ();
717	establish_connection ();	802	establish_connection ();
718	}	803	}
719		804
720	void	805	void
721	connection::send_data_packet (tap_packet *pkt, bool broadcast)	806	connection::send_data_packet (tap_packet *pkt)
722	{	807	{
723	vpndata_packet *p = new vpndata_packet;	808	vpndata_packet *p = new vpndata_packet;
724	int tos = 0;	809	int tos = 0;
725		810
726	if (conf->inherit_tos	811	// I am not hilarious about peeking into packets, but so be it.
727	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP	812	if (conf->inherit_tos && pkt->is_ipv4 ())
728	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
729	tos = (*pkt)[15] & IPTOS_TOS_MASK;	813	tos = (*pkt)[15] & IPTOS_TOS_MASK;
730		814
731	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	815	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
732	send_vpn_packet (p, si, tos);	816	send_vpn_packet (p, si, tos);
733		817
734	delete p;	818	delete p;
735		819
736	if (oseqno > MAX_SEQNO)	820	if (oseqno > MAX_SEQNO)
737	rekey ();	821	rekey ();
738	}	822	}
739		823
740	void	824	void
741	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	825	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)
742	{	826	{
743	if (ictx && octx)	827	if (ictx && octx)
744	send_data_packet (pkt, broadcast);	828	send_data_packet (pkt);
745	else	829	else
746	{	830	{
747	if (!broadcast)//DDDD	831	if (!broadcast)//DDDD
748	queue.put (new tap_packet (*pkt));	832	data_queue.put (new tap_packet (*pkt));
		833
		834	establish_connection ();
		835	}
		836	}
		837
		838	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)
		839	{
		840	if (ictx && octx)
		841	send_vpn_packet (pkt, si, tos);
		842	else
		843	{
		844	vpn_queue.put (new vpn_packet (*pkt));
749		845
750	establish_connection ();	846	establish_connection ();
751	}	847	}
752	}	848	}
753		849
…		…
759	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	855	slog (L_NOISE, "<<%d received packet type %d from %d to %d",
760	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	856	conf->id, pkt->typ (), pkt->src (), pkt->dst ());
761		857
762	switch (pkt->typ ())	858	switch (pkt->typ ())
763	{	859	{
764	case vpn_packet::PT_PING:	860	case vpn_packet::PT_PING:
765	// we send pings instead of auth packets after some retries,	861	// we send pings instead of auth packets after some retries,
766	// so reset the retry counter and establish a connection	862	// so reset the retry counter and establish a connection
767	// when we receive a ping.	863	// when we receive a ping.
768	if (!ictx)	864	if (!ictx)
		865	{
		866	if (auth_rate_limiter.can (rsi))
		867	send_auth_request (rsi, true);
		868	}
		869	else
		870	send_ping (rsi, 1); // pong
		871
		872	break;
		873
		874	case vpn_packet::PT_PONG:
		875	break;
		876
		877	case vpn_packet::PT_RESET:
769	{	878	{
770	if (auth_rate_limiter.can (rsi))	879	reset_connection ();
771	send_auth_request (rsi, true);	880
		881	config_packet p = (config_packet ) pkt;
		882
		883	if (!p->chk_config ())
		884	{
		885	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
		886	conf->nodename, (const char *)rsi);
		887	connectmode = conf_node::C_DISABLED;
		888	}
		889	else if (connectmode == conf_node::C_ALWAYS)
		890	establish_connection ();
772	}	891	}
773	else
774	send_ping (rsi, 1); // pong
775
776	break;	892	break;
777		893
778	case vpn_packet::PT_PONG:
779	break;
780
781	case vpn_packet::PT_RESET:	894	case vpn_packet::PT_AUTH_REQ:
782	{	895	if (auth_rate_limiter.can (rsi))
783	reset_connection ();
784
785	config_packet p = (config_packet ) pkt;
786
787	if (!p->chk_config ())
788	{	896	{
		897	auth_req_packet p = (auth_req_packet ) pkt;
		898
		899	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);
		900
		901	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))
		902	{
		903	if (p->prot_minor != PROTOCOL_MINOR)
		904	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
		905	conf->nodename, (const char *)rsi,
		906	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
		907
		908	if (p->initiate)
		909	send_auth_request (rsi, false);
		910
		911	rsachallenge k;
		912
		913	if (0 > RSA_private_decrypt (sizeof (p->encr),
		914	(unsigned char )&p->encr, (unsigned char )&k,
		915	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
		916	{
		917	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
		918	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		919	break;
		920	}
		921	else
		922	{
		923	delete octx;
		924
		925	octx = new crypto_ctx (k, 1);
		926	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
		927
		928	conf->protocols = p->protocols;
		929
		930	send_auth_response (rsi, p->id, k);
		931
		932	connection_established ();
		933
		934	break;
		935	}
		936	}
		937	else
789	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	938	slog (L_WARN, _("%s(%s): protocol mismatch"),
790	conf->nodename, (const char *)rsi);	939	conf->nodename, (const char *)rsi);
791	connectmode = conf_node::C_DISABLED;	940
		941	send_reset (rsi);
792	}	942	}
793	else if (connectmode == conf_node::C_ALWAYS)	943
794	establish_connection ();
795	}
796	break;	944	break;
797		945
798	case vpn_packet::PT_AUTH_REQ:	946	case vpn_packet::PT_AUTH_RES:
799	if (auth_rate_limiter.can (rsi))
800	{	947	{
801	auth_req_packet p = (auth_req_packet ) pkt;	948	auth_res_packet p = (auth_res_packet ) pkt;
802		949
803	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	950	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);
804		951
805	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	952	if (p->chk_config ())
806	{	953	{
807	if (p->prot_minor != PROTOCOL_MINOR)	954	if (p->prot_minor != PROTOCOL_MINOR)
808	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	955	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
809	conf->nodename, (const char *)rsi,	956	conf->nodename, (const char *)rsi,
810	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	957	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
811		958
812	if (p->initiate)
813	send_auth_request (rsi, false);
814
815	rsachallenge k;	959	rsachallenge chg;
816		960
817	if (0 > RSA_private_decrypt (sizeof (p->encr),	961	if (!rsa_cache.find (p->id, chg))
818	(unsigned char )&p->encr, (unsigned char )&k,	962	{
819	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))	963	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),
820	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),
821	conf->nodename, (const char *)rsi);	964	conf->nodename, (const char *)rsi);
		965	break;
		966	}
822	else	967	else
823	{	968	{
824	retry_cnt = 0;	969	crypto_ctx *cctx = new crypto_ctx (chg, 0);
825	establish_connection.set (NOW + 8); //? ;)	970
826	keepalive.reset ();	971	if (!p->hmac_chk (cctx))
		972	{
		973	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
		974	"could be an attack, or just corruption or an synchronization error"),
		975	conf->nodename, (const char *)rsi);
		976	break;
		977	}
827	rekey.reset ();	978	else
		979	{
		980	rsaresponse h;
828		981
		982	rsa_hash (p->id, chg, h);
		983
		984	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
		985	{
		986	prot_minor = p->prot_minor;
		987
		988	delete ictx; ictx = cctx;
		989
		990	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
		991
		992	si = rsi;
		993	protocol = rsi.prot;
		994
		995	connection_established ();
		996
		997	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
		998	conf->nodename, (const char *)rsi,
		999	p->prot_major, p->prot_minor);
		1000
		1001	if (::conf.script_node_up)
		1002	run_script (run_script_cb (this, &connection::script_node_up), false);
		1003
		1004	break;
		1005	}
		1006	else
		1007	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
		1008	conf->nodename, (const char *)rsi);
		1009	}
		1010
829	delete ictx;	1011	delete cctx;
830	ictx = 0;
831
832	delete octx;
833
834	octx = new crypto_ctx (k, 1);
835	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
836
837	conf->protocols = p->protocols;
838	send_auth_response (rsi, p->id, k);
839
840	break;
841	}	1012	}
842	}	1013	}
843
844	send_reset (rsi);
845	}	1014	}
846		1015
		1016	send_reset (rsi);
847	break;	1017	break;
848		1018
849	case vpn_packet::PT_AUTH_RES:	1019	case vpn_packet::PT_DATA_COMPRESSED:
850	{	1020	#if !ENABLE_COMPRESSION
851	auth_res_packet p = (auth_res_packet ) pkt;	1021	send_reset (rsi);
		1022	break;
		1023	#endif
852		1024
853	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1025	case vpn_packet::PT_DATA_UNCOMPRESSED:
854		1026
855	if (p->chk_config ())	1027	if (ictx && octx)
856	{	1028	{
857	if (p->prot_minor != PROTOCOL_MINOR)	1029	vpndata_packet p = (vpndata_packet )pkt;
858	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
859	conf->nodename, (const char *)rsi,
860	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
861		1030
862	rsachallenge chg;	1031	if (!p->hmac_chk (ictx))
863		1032	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
864	if (!rsa_cache.find (p->id, chg))	1033	"could be an attack, or just corruption or an synchronization error"),
865	slog (L_ERR, _("%s(%s): unrequested auth response"),
866	conf->nodename, (const char *)rsi);	1034	conf->nodename, (const char *)rsi);
867	else	1035	else
868	{	1036	{
869	crypto_ctx *cctx = new crypto_ctx (chg, 0);
870
871	if (!p->hmac_chk (cctx))
872	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
873	"could be an attack, or just corruption or an synchronization error"),
874	conf->nodename, (const char *)rsi);
875	else	1037	u32 seqno;
		1038	tap_packet *d = p->unpack (this, seqno);
		1039
		1040	if (iseqno.recv_ok (seqno))
876	{	1041	{
877	rsaresponse h;	1042	vpn->tap->send (d);
878		1043
879	rsa_hash (p->id, chg, h);	1044	if (si != rsi)
880
881	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
882	{	1045	{
883	prot_minor = p->prot_minor;	1046	// fast re-sync on connection changes, useful especially for tcp/ip
884
885	delete ictx; ictx = cctx;
886
887	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
888
889	si = rsi;	1047	si = rsi;
890		1048
891	rekey.set (NOW + ::conf.rekey);	1049	slog (L_INFO, _("%s(%s): socket address changed to %s"),
892	keepalive.set (NOW + ::conf.keepalive);
893
894	// send queued packets
895	while (tap_packet *p = queue.get ())
896	{
897	send_data_packet (p);
898	delete p;
899	}
900
901	connectmode = conf->connectmode;
902
903	slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"),
904	conf->nodename, (const char *)rsi,	1050	conf->nodename, (const char )si, (const char )rsi);
905	strprotocol (protocol),
906	p->prot_major, p->prot_minor);
907
908	if (::conf.script_node_up)
909	run_script (run_script_cb (this, &connection::script_node_up), false);
910
911	break;
912	}	1051	}
		1052
913	else	1053	delete d;
914	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),	1054
915	conf->nodename, (const char *)rsi);	1055	break;
916	}	1056	}
917
918	delete cctx;
919	}	1057	}
920	}	1058	}
921	}
922		1059
923	send_reset (rsi);	1060	send_reset (rsi);
924	break;	1061	break;
925		1062
926	case vpn_packet::PT_DATA_COMPRESSED:
927	#if !ENABLE_COMPRESSION
928	send_reset (rsi);
929	break;
930	#endif
931
932	case vpn_packet::PT_DATA_UNCOMPRESSED:
933
934	if (ictx && octx)
935	{
936	vpndata_packet p = (vpndata_packet )pkt;
937
938	if (rsi == si)
939	{
940	if (!p->hmac_chk (ictx))
941	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
942	"could be an attack, or just corruption or an synchronization error"),
943	conf->nodename, (const char *)rsi);
944	else
945	{
946	u32 seqno;
947	tap_packet *d = p->unpack (this, seqno);
948
949	if (iseqno.recv_ok (seqno))
950	{
951	vpn->tap->send (d);
952
953	if (p->dst () == 0) // re-broadcast
954	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
955	{
956	connection c = i;
957
958	if (c->conf != THISNODE && c->conf != conf)
959	c->inject_data_packet (d);
960	}
961
962	delete d;
963
964	break;
965	}
966	}
967	}
968	else
969	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
970	}
971
972	send_reset (rsi);
973	break;
974
975	case vpn_packet::PT_CONNECT_REQ:	1063	case vpn_packet::PT_CONNECT_REQ:
976	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1064	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
977	{	1065	{
978	connect_req_packet p = (connect_req_packet ) pkt;	1066	connect_req_packet p = (connect_req_packet ) pkt;
979		1067
980	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1068	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything
981	conf->protocols = p->protocols;
982	connection *c = vpn->conns[p->id - 1];	1069	connection *c = vpn->conns[p->id - 1];
		1070	conf->protocols = p->protocols;
983		1071
984	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",	1072	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
985	conf->id, p->id, c->ictx && c->octx);	1073	conf->id, p->id, c->ictx && c->octx);
986		1074
987	if (c->ictx && c->octx)	1075	if (c->ictx && c->octx)
988	{	1076	{
989	// send connect_info packets to both sides, in case one is	1077	// send connect_info packets to both sides, in case one is
990	// behind a nat firewall (or both ;)	1078	// behind a nat firewall (or both ;)
991	c->send_connect_info (conf->id, si, conf->protocols);	1079	c->send_connect_info (conf->id, si, conf->protocols);
992	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1080	send_connect_info (c->conf->id, c->si, c->conf->protocols);
993	}	1081	}
		1082	else
		1083	c->establish_connection ();
994	}	1084	}
995		1085
996	break;	1086	break;
997		1087
998	case vpn_packet::PT_CONNECT_INFO:	1088	case vpn_packet::PT_CONNECT_INFO:
999	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1089	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1000	{	1090	{
1001	connect_info_packet p = (connect_info_packet ) pkt;	1091	connect_info_packet p = (connect_info_packet ) pkt;
1002		1092
1003	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1093	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything
1004	conf->protocols = p->protocols;	1094
1005	connection *c = vpn->conns[p->id - 1];	1095	connection *c = vpn->conns[p->id - 1];
1006		1096
		1097	c->conf->protocols = p->protocols;
		1098	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
		1099	p->si.upgrade_protocol (protocol, c->conf);
		1100
1007	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1101	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
1008	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1102	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);
1009		1103
		1104	const sockinfo &dsi = forward_si (p->si);
		1105
		1106	if (dsi.valid ())
1010	c->send_auth_request (p->si, true);	1107	c->send_auth_request (dsi, true);
1011	}	1108	}
1012		1109
1013	break;	1110	break;
1014		1111
1015	default:	1112	default:
1016	send_reset (rsi);	1113	send_reset (rsi);
1017	break;	1114	break;
1018
1019	}	1115	}
1020	}	1116	}
1021		1117
1022	void connection::keepalive_cb (tstamp &ts)	1118	void connection::keepalive_cb (time_watcher &w)
1023	{	1119	{
1024	if (NOW >= last_activity + ::conf.keepalive + 30)	1120	if (NOW >= last_activity + ::conf.keepalive + 30)
1025	{	1121	{
1026	reset_connection ();	1122	reset_connection ();
1027	establish_connection ();	1123	establish_connection ();
1028	}	1124	}
1029	else if (NOW < last_activity + ::conf.keepalive)	1125	else if (NOW < last_activity + ::conf.keepalive)
1030	ts = last_activity + ::conf.keepalive;	1126	w.at = last_activity + ::conf.keepalive;
1031	else if (conf->connectmode != conf_node::C_ONDEMAND	1127	else if (conf->connectmode != conf_node::C_ONDEMAND
1032	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1128	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1033	{	1129	{
1034	send_ping (si);	1130	send_ping (si);
1035	ts = NOW + 5;	1131	w.at = NOW + 5;
1036	}	1132	}
		1133	else if (NOW < last_activity + ::conf.keepalive + 10)
		1134	// hold ondemand connections implicitly a few seconds longer
		1135	// should delete octx, though, or something like that ;)
		1136	w.at = last_activity + ::conf.keepalive + 10;
1037	else	1137	else
1038	reset_connection ();	1138	reset_connection ();
1039	}	1139	}
1040		1140
1041	void connection::connect_request (int id)	1141	void connection::send_connect_request (int id)
1042	{	1142	{
1043	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1143	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);
1044		1144
1045	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1145	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);
1046	p->hmac_set (octx);	1146	p->hmac_set (octx);
…		…
1049	delete p;	1149	delete p;
1050	}	1150	}
1051		1151
1052	void connection::script_node ()	1152	void connection::script_node ()
1053	{	1153	{
1054	vpn->script_if_up (0);	1154	vpn->script_if_up ();
1055		1155
1056	char *env;	1156	char *env;
1057	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1157	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1058	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1158	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1059	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1159	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1060	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1160	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1061	}	1161	}
1062		1162
1063	const char *connection::script_node_up (int)	1163	const char *connection::script_node_up ()
1064	{	1164	{
1065	script_node ();	1165	script_node ();
1066		1166
1067	putenv ("STATE=up");	1167	putenv ("STATE=up");
1068		1168
1069	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1169	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";
1070	}	1170	}
1071		1171
1072	const char *connection::script_node_down (int)	1172	const char *connection::script_node_down ()
1073	{	1173	{
1074	script_node ();	1174	script_node ();
1075		1175
1076	putenv ("STATE=down");	1176	putenv ("STATE=down");
1077		1177
1078	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1178	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";
1079	}
1080
1081	// send a vpn packet out to other hosts
1082	void
1083	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1084	{
1085	if (protocol & PROT_IPv4)
1086	vpn->send_ipv4_packet (pkt, si, tos);
1087	else
1088	vpn->send_udpv4_packet (pkt, si, tos);
1089	}	1179	}
1090		1180
1091	connection::connection(struct vpn *vpn_)	1181	connection::connection(struct vpn *vpn_)
1092	: vpn(vpn_)	1182	: vpn(vpn_)
1093	, rekey (this, &connection::rekey_cb)	1183	, rekey (this, &connection::rekey_cb)

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Comparing gvpe/src/connection.C (file contents): Revision 1.2 by pcg, Wed Apr 2 03:25:17 2003 UTC vs. Revision 1.23 by pcg, Wed Oct 22 00:42:53 2003 UTC

Diff Legend

Comparing gvpe/src/connection.C (file contents):
Revision 1.2 by pcg, Wed Apr 2 03:25:17 2003 UTC vs.
Revision 1.23 by pcg, Wed Oct 22 00:42:53 2003 UTC